Why doesn't v-for reactivity work?

Question

Vue.js

Reactivity does not work in v-for, I googled that you need to add an ID, it did not help. The variable is updated when the external element is clicked, new data is displayed in the console after the click, and the component is not updated

html component

<devices 
            v-for="device in roominfo"
            :key="device.id"
            :device="device"
        ></devices>

js component

Vue.component('devices', {
    props: ['device','key'],
    template: '<div class="roominfo"">{{ device.name }} - {{ key }}</div>'
});

APP

var app = new Vue({
    el: '#app',
    data: {
        devices: [],
        roominfo: []
    },
    created(){
        fetch('/smart-home.php')
            .then((response) => {
                if(response.ok) {
                    return response.json();
                }
            
                throw new Error('Network response was not ok');
            })
            .then((json) => {
                this.devices = json;
                this.getRoomDevices("133");
            })
            .catch((error) => {
                console.log(error);
            });
    },
    methods:{
        getrooms: function () {
            var rooms = new Set();
            for (let device of this.devices) {
                rooms.add(device.room);
            }
    
            return Array.from(rooms).sort();
        },
        getRoomDevices: function (roomName) {
            
            let newdata = [];
            
            for (let device of this.devices) {
                if(device['room'] == roomName){
                    newdata.push(device);
                }
            }
            this.roominfo = newdata;
            console.log(this.roominfo);
        }
    }
});

Data in a variable

Answer 1

Lord I'm down.. roominfo class and roominfo variable in vue...

Answer 2

Comrade code
then((json) => {
this.devices = json;
this.getRoomDevices("133");
})
It doesn't work, this is not in this context, try to access the global app. devices = json; and so far and everything will work out